The display order of the items in a dropdown list or listbox can be altered via the ORDER BY step in the Query Wizard.
Step 1: In the Page Layout Spreadsheet, select a dropdown list control and open the Data Sources tab.
Step 2: In the Data Sources tab, select the appropriate data source and open the Query Wizard (Edit…).
Step 3: Go to the ORDER BY step and select the sort order. For example, the values in the CompanyName field can be arranged according to the City:
Step 4: Rebuild and run your application.